New accounting and financial reporting pronouncements - Narrative (Detail) - USD ($) $ in Millions	Sep. 30, 2024	Jan. 01, 2024	Dec. 31, 2023
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Retained earnings	$ 676,524		$ 607,350
Cumulative effect, period of adoption, adjustment [Member] | ASU 2023-02 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Retained earnings		$ 127